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 ECET 340 Slingshot Academy snaptutorial
ECET 340 Week 1 HomeWork 1
ECET 340 Entire Course (All ilabs and Homework)
Give three examples each of internal and external
peripheral devices as referenced to the HCS12
microcontroller and not an entire PC. (2
points)   2. Given the requirements of each
signals destination must match the capabilities
of the signals source, name some of the
electrical signal parameters that must be
considered when designing an interface between
two different hardware components. (2
points)   3. Write down the instructions needed
to program PORT A for pins PA7, PA4-PA0 as inputs
and PA6-PA5 as outputs. Answer should be a valid
C language statement. (2 points)  
ECET 340 Week 1 HomeWork 1 ECET 340 Week 1 iLab
1 ECET 340 Week 2 HomeWork 2 ECET 340 Week 2 iLab
2 ECET 340 Week 3 HomeWork 3 ECET 340 Week 3 iLab
3 ECET 340 Week 4 HomeWork 4 ECET 340 Week 4 iLab
4 ECET 340 Week 5 HomeWork 5
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 ECET 340 Slingshot Academy snaptutorial
ECET 340 Week 2 HomeWork 2
ECET 340 Week 1 iLab 1
1. Where does program control transfer to when an
interrupt occurs? 2 points 2. Which one of the
following Interrupts has highest priority? 2
points 3. RAM Vector table addresses 3E52
belongs to which interrupt? 2 points 4. Before
exiting an ISR, the programmer should use which
command? 2 points 5. In which one of the
following sequences is the stack pulled by rti?
3 points 6. Given the starting address for the
TC0 Interrupt is to become 5000. Write the
assembly instruction necessary to place this ISR
address into the interrupt vector table and then
unmask the interrupt (assembly only). 3 points
OBJECTIVES To become familiar with
Microcontroller MC9S12 parallel ports and how
simple input and output devices are interfaced
through them. To learn how to program I/O
instructions in C language. To learn how to
organize a program to read data from input ports,
process the data, and display the result on a
simple output device.
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 ECET 340 Slingshot Academy snaptutorial
ECET 340 Week 3 HomeWork 3
ECET 340 Week 2 iLab 2
ECET 340 Week 2 iLab 2
1. Sketch a circuit that can be used to debounce
a pushbutton and explain how it works. (4 points
max) 2. In Figure 7.32 on page 339 of the Huang
textbook, if the row has and the columnsare ,
which key is pressed? (2 points max) 3. In Figure
7.32 on page 339 of the Huang textbook, explain
why the 10k? resistors ties to VCC are required.
(2 points max) 4. Write down the lines of C code
(interrupt service routine, ISR) that generates
an interrupt when Port H pin 0 becomes a logic
1. Within this ISR,
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 ECET 340 Slingshot Academy snaptutorial
ECET 340 Week 4 HomeWork 4
ECET 340 Week 3 iLab 3a
SOLVED ECET 340 iLAB3 OBJECTIVES To learn the
basic operation of a keypad. To understand how to
interface a keypad to a microprocessor. To learn
how to program a keypad driver in C language. To
learn how to program a keypad activated interrupt
that identifies the key being pressed and
displays or otherwise returns its value to the
main program.
Determine the conversion time for an ADC0804
(8-bit), where 66 clocks per bit are required, if
its clock frequency is 50 kHz.   2. If an 8-bit
SAR has Vref 10 V, what is the binary value for
an input voltage of 7.28 V?   3. What is the
percent error for the binary answer found in
Problem 2?   4. Given an 24 MHz bus speed. Write
down the line(s) of instruction which set the
ATD1 unit for 2MHz conversion frequency, 10-bit
resolution and 8 A-to-D clocks per sample time.  
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 ECET 340 Slingshot Academy snaptutorial
ECET 340 Week 5 HomeWork 5
ECET 340 Week 4 iLab 4
Explain, briefly, why an analog restoring filter
is sometimes used at the output of a DAC.   2.
Given Iref 2 mA for a DAC1408 IC, find Iout for
the input 1110 1110   3. Find the number of
discrete voltages output by a 12-bit DAC. Show
work. 4. Use the internet to locate the data
sheet for an MC1408 DAC. From it find, for the
MC1408-7 version, the following a. The settling
time b. Accuracy at full scale output current
(1.99 mA), 25ºC
OBJECTIVES To learn how to use A-to-D converters
to digitize signals from analog input devices. To
learn how to write a C language program that
samples the data from an analog device, digitizes
it and formats it for output on an LCD. To become
more proficient in programming displays for
real-time operation.
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 ECET 340 Slingshot Academy snaptutorial
ECET 340 Week 6 HomeWork 6
ECET 340 Week 5 iLab 5
What are the four main functions of the HC12
Timer unit?  2. Two input capture events occur at
counts 0x1037 and 0xFF20 of the free-running
counter. How many counts (in decimal) have
transpired between these two events?  3. What is
the maximum time possible before the free-running
counter overflows when the e MHz?  4. Two input
capture events occur at 0x1037 and 0x002A. If the
prescaler bits PR210 are set to 101 and the e
clock is 24 MHz, how much time as transpired
between the two events?  
Scenario/Summary This week's lab covers two
areas, conversion of digital HCS12 signals to an
analog format, and the use of a Serial Peripheral
Interface (SPI) to transfer data, and commands
between the HCS12, and the DAC peripheral.
Deliverables For this lab, the deliverables
include the cover sheet,
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 ECET 340 Slingshot Academy snaptutorial
ECET 340 Week 7 HomeWork 7
ECET 340 Week 6 iLab 6
1. The movable part of the solenoid is the 2
points 2. Why is the 6N139 optoisolator used in
the interfaces to devices such as large motors?
2 points 3. Calculate the number of steps per
revolution for a stepper motor with a step angle
of 7.5. 2 points 4. How is stepper motor speed
controlled? State any two ways a program can do
this. 2 points 5. For this problem,
ECET 340 Week 6 iLab 6
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 ECET 340 Slingshot Academy snaptutorial
ECET 340 Week 7 iLab 7
ECET 340 Week 7 iLab 7
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 ECET 340 Slingshot Academy snaptutorial
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